This discourse was taught by the Rebbe on Shavuot in 1969. It discusses the word 'saying' in the verse at the beginning of the Ten Commandments: 'And G-d spoke all these Commandments saying'.  Usually, in the Torah, 'saying' means to tell someone else.  But at the Giving of the Torah, all the Jews were present, and also all the souls of the Jews who would ever live in the future, including all proselytes.  

So what does 'saying' mean? The discourse presents three interesting explanations in terms of the intimate bond of the individual with the Divine, and his or her task in the world around us.